Line-annunciator.



No. 742.165. PATENTBD OUT. 27,1903.

H. P. GLAUSBK. LINE ANNUNOIATOR.

. APPLICATION FILED APR; 1, 1801.

H0 MODEL- 2 SHEETS-SHEET 1,.

TNE nonms PETERS ca. mow-Luna WASHINGTON. 04 c.

No. 742,165. PATENTED OCT. 27, 1903. H. P. OLAUSEN. LINE ANNUNGIATOR.

- APPLICATION FILED APR. 1, 1901.

THE Norms PEIERs no. PHOTO-UTHO.. wunmawu, D. c.

UNITED STATES Patented October 27, 1903. 'i

' PATENT OFFIcE.

HENRY P. OLAUSEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN ELEO- TRIO TELEPHONE COMPANY, A CORPORATION OF NEW JERSEY.

LlNE-ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 742,165, dated October 2'7, 1903.

Application filed April 1, 1901. Serial No. 53;765. (N0 model.)

provements-in Line-Annunciators, of which the following is a specification.

My invention relates to telephone systems and annunciators therefor, and has specialreference to those systems in which the actuating-coil of the annunciator is bridged across the line at the central office and in which means is provided to prevent the shutter or drop of the annunciator from falling when a cord-plug is inserted in any of the springjacks of the line.

In the ordinary'annunciator with a bridged actuating-coil it is found that in attempting to call or ring the subscriber the drop or shutter of that line is thrown or caused to fall, which results not only in'extra work for the operator on whose section the particular drop is located to restore the same, but in confusion as well when the connection is made and the ringing done at one of the other sections of the board, for of course the operator at the first-named section will think the signal indicates a call and will connect her telephone with that subscribers line.

My invention has for its object the provision of an efficient, simple, and cheap annnnciator system and apparatus for preventing this undesired falling ofthe drop or shutter;

:and it therefore consists in an annunciator of magnetic material,an armature forthe main coil adapted to normally hold said annunciator in raised position, and an auxiliary or retaining coil placed between the said armature and shutter and adapted to attract both, together with a localcircuit for said auxiliary or retaining coil having a'battery therein and normally open terminals in the several springjacks of the line, whereby upon insertion of the plug for any purpose. into any of the spring-jacks the local circuit containing said auxiliary coil will be closed and the coil energized to attract and hold in normal position both the magnetic shutter and the armature for the main coil.

The invention further consists in the atrangement and combination of parts hereinafter fullydescribed,and particularly set forth in the appended claims.

In the accompanying drawings, forming a part of this specification, in which the same reference characters are used to designate like parts'throughout, Figure l is a diagrammatic view showing the application of the annunciator to'a telephone-line and central oliice. Fig. 2 is a side elevation of the annunciator. Fig. 3 is a plan View of the same.

Fig. 4 is a rear end elevation thereof; Fig. 7 5, a front elevation of the same, and Fig. 6 a

perspective View of the main-coil armature with its shutter-retaining arm.

In the figures the telephone subscribers station A is provided with the usual apparatus, such as a bridged bell 2, transmitter 3, receiver 4, induction-coil 5, local battery 6, and normally shunted generator 7.- This substation is connected with the central office 0 by means of the lineconductors 8 and 9, which may lead through all thesections of the switchboard if it be a multiple board. The annunciator 10 has its main coil 11 included in the main line by means of the branch or bridge 12, connected with the line-wires 8 and 9. An

armature 13, pivoted at, its lower edge 13,

which is made of magnetic material, as soft iron,-and which is adapted to fall into a hori- 'zontal position upon being released from the catch 15 by virtue of the operation of coil 11 and armature 13. The drop 16 is restored by is placed in line with the main coil between the armature 13 and shutter 16, so as to at tract both when it isenergized. This coil 17 is included in an auxiliary or local circuit hand by the operator. An' auxiliary coil 17 0 containing the battery 18, branches 18 and 18 and the terminals 19 and 20 in each of Y the jacks 22 connected with the telephoneline. The latter may take any form desired in the jack construction, but should be normally open and arranged to be closed by the insertion of the plug.

Upon the operation of the subscribers generator 7 the main coil 11 of the annunciator is energized to operate the armature 13, lift the arm 14, and release the shutter 16. The operator, seeing the number exposed by the fallen shutter, will restore the same by hand and insert the proper plug in the subscribers jack 22, which closes the contacts 19 and 20 in the said jack, and thus energizing the auxiliary coil 17, which attracts both the armature 13 and shutter 16 to thereafter hold them firmly closed as long as the plug is in the jack. When it is desired to call asubscriber from the central office, the proper plug, as 23, is inserted in the jack 22 and the ringinggenerator 24 connected with that plug by means of the ringing-key 25. Ringing or calling current now flows out over the line to the subscribers station to operate his bell 2, and a portion of it also passes through the bridge 12, containing the coil 11 of the annunciator belonging to that line. It is found in practice that a considerable amount of current at this time passes therethrough. This would operate armature 13 and allow the sh utter 16 to fall, causing more or less confusion, annoyance, and trouble to the operator at that section of the switchboard were it not for the fact that the auxiliary coil 17 is also energized at this time by the closure of its circuit at the jack 22 to firmly attract the shutter and also the armature, whereby no amount of ringing-current passing through the coil 11 would cause the same to fall. This last feature is of the greatest importance in an annunciator of this kind. So far as some features of the invention are concerned and some of the combinations the said coil 17 may attract only the shutter or drop 16; but the strong attraction of both prevents noise as well as a sure retention of the drop in raised position.

Referring to Figs. 2 to 6, the construction of the annunciator is more clearly shown, and consists of the main-line coil 11, provided with a tubular shell through which project the rearwardly-extending coil-terminals 31, the end of the shell being closed by the circular plate 30, having screws passing through ears or lugs 30 on the shell and end plate 30. The forward end of the shell is secured to a brass casting 32, as by screws 32*, which casting is provided with an upright portion or plate 33, secured at the back of the front plate 34. The armature 13 of the coil 30 consists of a circular disk pivoted at its lower edge or side upon screws 36 in the casting 32, a central screw 37 being provided in said armature to strike the end of the magnet-core to properly adjust the same and to prevent its freezing to the poles of the magnet. This armature13 carries at its upper edge an arm 14, which is provided at its forward end with a catch 15, adapted to normally catch over the upper edge of the magnetic shutter 16, as shown in Fig. 5, the shutter or drop being pivoted at its lower edge 39 to a brass plate 40, bearing the number of the drop, and secured, as by screws, to the brass plate 4O on the front side of the plate 34. This front plate 34 may be a continuous strip, to which the coils are secured on one side and the drops on the other. The adjustment required of the catch is so accurate that a convenient method of accomplishing it is to make the arm 14 a trifle longer than necessary and then crimping or reversely bending it, as at 14", by a suitable tool or in other desired manner to shorten it. If too much crimping occurs, the bends are easily straightened out to lengthen the arm again. The auxiliary coil 17 is also supported in said casting 2 at the rear of the plate 33 and between the side members of the casting,with its core 38 projecting through the several plates 33, 34, 40, and 40 within operative relation to the magnetic shutter 10. It also extends rearwardly, so as to act upon the armature 13. The operation is as previously described with reference to the diagram.

Various changes and alterations may he made in the details of the construction and arrangement without departing from the spirit of my invention. I do not, therefore, wish to be limited to such details.

What I claim is 1. A line-annunciator comprising a signaling-electromagnet, an armature arranged at the forward end of said signaling-electromagnet, a locking electromagnet arranged in front of said armature, a plate secured to the front of said locking-magnet, and a drop pivoted to the front of said plate and adapted to be attracted by said locking-magnet, the armature thus located between the two magnets being provided with an arm adapted to engage and release the drop when the signalingmagnet is energized.

2. A line-annunciator comprising a front plate, a signaling-magnet, a pair of side bars connecting said front plate with said magnet, a locking-magnet mounted upon the front plate, the magnets and front plate all being arranged in line horizontally with the locking-magnet between the front plate and the signaling-magnet, a pivoted armature mounted between the opposing ends of said magnets, and a drop pivoted to the front of said plate and adapted to be attracted by said locking-magnet, the said armature having an arm adapted to engage and release the drop when the signaling-magnet is energized.

3. A line-annunciator comprising a signaling-magnet, an armature pivoted in front of said magnet, a locking-magnet mounted in front of said armature, a drop pivoted in front of and adapted to be attracted by the said locking-magnet, and an arm mounted upon said armature and adapted to release said drop when the signaling-magnet is energized.

4. The combination of asignaling-magnet, an armature pivoted in front of said magnet, a locking-magnet mounted in front of said armature, a front plate secured to the forward end of said locking-magnet, a drop pivoted.

upon said plate and adapted to be attracted by said locking-magnet, an arm on said armature adapted to release the drop when the signaling-magnet is energized, a spring-jack having normallyopen contacts connected with the terminals of said locking-magnet, a

battery interposed between one of said 0011- tacts and one terminal of said locking-magnet, and a switch-plug adapted for insertion in said jack to bring said contacts together, substantially as described.

5. An annunciator comprising a front plate, a locking-electromagnet having its core extending through said plate, a drop arranged in front of the projecting end of said core, a signaling electromagnet arranged back of said first-mentioned magnet, and an armature pivoted between the opposing ends of said magnets and provided with a catch adapted to engage and hold said drop in its normal position. I

6. An annunciator comprising a signalingelectromagnet, a drop of magnetic material, an armature for said magnet having a catch adapted to hold said drop in its normal position, and a locking-electromagnet having one end adapted to attract said drop, and having its other end arranged to attract said armature, said armature being adapted to swing between said magnets.

7. In an electrical signaling device,the combination of a visual indicator, a locking de- Vice for normally holding said indicator in its I normal position, electromagnetic means for actuating said locking device to release said indicator, and an electromagnet having its core arranged to influence both the said locking device and the said indicator, said locking device or a portion thereof being arranged for vibratory movement between said electromagnetic means and said magnet.

Signed by me at Chicago, Cook county, Illinois, this 23d day of March, 1901.

HENRY P. CLAUSEN.

Witnesses:

CHAS. G. BULKLEY, HARRY P. BAUMGARTNER. 

